Summary Of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Loan impairment threshold period	90 days
Threshold of reporting unit goodwill carrying value for further analysis	$ 0
Goodwill impairment charges	0
Allowance for doubtful accounts	19,800,000	$ 19,600,000
Incremental payments due upon termination of contract	0
Operating lease right-of-use assets, net	775,949,000	750,734,000
Lease liabilities	$ 819,682,000	$ 799,100,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts payable and accrued expenses	Accounts payable and accrued expenses
Office Equipment [Member] | Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life	2 years
Office Equipment [Member] | Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life	7 years
Building and Building Improvements [Member] | Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life	3 years
Building and Building Improvements [Member] | Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life	39 years
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative adjustments for accounting changes	$ 7,800,000